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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762e31e78fd3822577050ec30da6c87caebe5d28a884b668748e9fd5a85ba8d9' 
  AND token = '5Frn4rRhBW2cW5J2DlabVysRmbNBDgQFFbf+emnbGD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}